From 6d8bef8c05ea5dcb95f5930954cd6bd28868c2c9 Mon Sep 17 00:00:00 2001
From: Hendrik Leppkes <h.leppkes@gmail.com>
Date: Fri, 16 Feb 2018 21:24:59 +0100
Subject: [PATCH] build: restore using dlltool/lib.exe for creating Win32 .lib
 files

The GCC generated import libraries don't work properly when being imported
by MSVC, resulting in missing symbols at runtime.

This reverts 5b5365fe9 and partially reverts changes from 98a9b1f0d
---
 configure | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 99c53d482a..3b06b86a6e 100755
--- a/configure
+++ b/configure
@@ -4994,6 +4994,10 @@ case $target_os in
         ;;
     mingw32*|mingw64*)
         target_os=mingw32
+        LIBTARGET=i386
+        if enabled x86_64; then
+            LIBTARGET="i386:x86-64"
+        fi
         if enabled shared; then
             # Cannot build both shared and static libs when using dllimport.
             disable static
@@ -5005,7 +5009,14 @@ case $target_os in
         SLIBSUF=".dll"
         SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
         SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
-        SLIB_EXTRA_CMD='cp $(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) $(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib)'
+        if check_cmd lib.exe -list; then
+            SLIB_EXTRA_CMD=-'lib.exe -nologo -machine:$(LIBTARGET) -def:$$(@:$(SLIBSUF)=.def) -out:$(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib)'
+            if enabled x86_64; then
+                LIBTARGET=x64
+            fi
+        else
+            SLIB_EXTRA_CMD=-'$(DLLTOOL) -m $(LIBTARGET) -d $$(@:$(SLIBSUF)=.def) -l $(SUBDIR)$(SLIBNAME:$(SLIBSUF)=.lib) -D $(SLIBNAME_WITH_MAJOR)'
+        fi
         SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
         SLIB_INSTALL_LINKS=
         SLIB_INSTALL_EXTRA_SHLIB='$(SLIBNAME:$(SLIBSUF)=.lib)'
@@ -5013,6 +5024,7 @@ case $target_os in
         SLIB_CREATE_DEF_CMD='EXTERN_PREFIX="$(EXTERN_PREFIX)" AR="$(AR_CMD)" NM="$(NM_CMD)" $(SRC_PATH)/compat/windows/makedef $(SUBDIR)lib$(NAME).ver $(OBJS) > $$(@:$(SLIBSUF)=.def)'
         SHFLAGS='-shared -Wl,--out-implib,$(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) -Wl,--disable-auto-image-base $$(@:$(SLIBSUF)=.def)'
         enabled x86_64 && objformat="win64" || objformat="win32"
+        dlltool="${cross_prefix}dlltool"
         ranlib=:
         enable dos_paths
         check_ldflags -Wl,--nxcompat,--dynamicbase
@@ -6886,6 +6898,7 @@ LD_O=$LD_O
 X86ASM_O=$X86ASM_O
 LD_LIB=$LD_LIB
 LD_PATH=$LD_PATH
+DLLTOOL=$dlltool
 WINDRES=$windres
 DEPWINDRES=$dep_cc
 DOXYGEN=$doxygen
@@ -6939,6 +6952,7 @@ LIB_INSTALL_EXTRA_CMD=$LIB_INSTALL_EXTRA_CMD
 EXTRALIBS=$extralibs
 COMPAT_OBJS=$compat_objs
 INSTALL=$install
+LIBTARGET=${LIBTARGET}
 SLIBNAME=${SLIBNAME}
 SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}
 SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}